i have no ARC capability on the home theater audio system, so ARC or eARC is out of the question..I have run into the same issue just alone in watching live TV which gives me a clue why I experience what I experience in watching NetFlix. So, in other words, watching live TV, when the audio stream is AAC, colune control is possible through GTV remote vol control up/down. I was flipping through another live TV channel where audio was streaming in DD format and the upon pressing volume control up/down, the pop up message 'audio passthrough active, use TV IR to control the volume' shows up. only Mute button works in this case. So any help in knowing how to fix this issue would be helpful.